<template>
	<view>
		<view class="search-box">
			<uni-search-bar 
				:focus="true"
				clearButton="auto"
				cancelButton="none"
				@input="input"
			>
			</uni-search-bar>
			
			<!-- 搜索建议列表 -->
			<view class="sugg-list" v-if="searchResults.length !== 0">
				<view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoGoodsDeatail(item.goods_id)">
					<view class="goods-name">
						{{ item.goods_name }}
					</view>
					<uni-icons type="arrowright" size="16"></uni-icons>
				</view>
			</view>
			
			<!-- 搜索历史记录 -->
			<view class="history-box" v-else>
				<view class="history-title">
					<text>搜索历史</text>
					<uni-icons type="trash" size="17" @click="clean"></uni-icons>
				</view>
				<view class="history-list">
					<uni-tag :inverted="true" :text="item" v-for="(item, i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
				</view>
			</view>

		</view>		
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer: null,
				kw: '',
				// 搜索结果列表
				searchResults: [],
				// 搜索历史记录
				historyList: []
			};
		},
		onLoad() {
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods: {
			input(e) {
				clearTimeout(this.timer)
				this.timer = setTimeout(() => {
					this.kw = e
					this.getSearchList()
				}, 500)
			},
			async getSearchList() {
				// 判断搜索关键词是否为空
				if(this.kw.length === 0) {
					this.searchResults = []
					return
				}
				// 查询搜索建议结果
				const {data: res} = await uni.$http.get('/api/public/v1/goods/qsearch', {query: this.kw})
				// console.log(res);
				if(res.meta.status !== 200) return uni.$showMsg()
				this.searchResults = res.message
				
				// 搜索结果放入缓存
				this.saveSearchHistory()
			},
			gotoGoodsDeatail(id) {
				// console.log(id);
				uni.navigateTo({
					url: '/subpkg/good_detail/good_detail?goods_id=' + id
				})
			},
			saveSearchHistory() {
				// Set解决搜索关键词重复
				const set = new Set(this.historyList)
				set.delete(this.kw)
				set.add(this.kw)
				console.log(set);
				this.historyList = Array.from(set)
				// 搜索关键词存入缓存
				uni.setStorageSync('kw', JSON.stringify(this.historyList))
				// this.historyList.push(this.kw)
			},
			clean() {
				this.historyList = []
				uni.setStorageSync('kw', '[]')
			},
			gotoGoodsList(kw) {
				uni.navigateTo({
					url: '/subpkg/good_list/good_list?query=' + kw
				})
			}
		},
		computed: {
			// 搜索结果顺序翻转
			histories() {
				// 由于数组是引用类型，不要直接对原数组操作，[...]新建一个与内存数组无关数组
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
.search-box {
	position: sticky;
	top: 0;
	z-index: 999;
}
.uni-searchbar {
	background-color: #c00000;
}
.sugg-list {
	padding: 0 5px;
	.sugg-item {
		display: flex;
		justify-content: space-between;
		align-items: center;
		font-size: 12px;
		padding: 10px 5px;
		border-bottom: 1px solid #efefef;
		.goods-name {
			white-space: nowrap;
			overflow: hidden;
			text-overflow: ellipsis;
			margin-right: 3px;
			color: #555;
		}
	}
}
.history-box {
	.history-title {
		display: flex;		justify-content: space-between;
		align-items: center;
		padding: 10px;
		border-bottom: 1px solid #efefef;
		font-size: 12px;
	}
	.history-list {
		padding: 10px;
		.uni-tag {
			margin-top: 5px;
			margin-right: 5px;
		}
	}
}
</style>
